Switch JavaScript engine to goja

* Switch from otto to goja for JavaScript engine.
* goja supports many ES6 syntax features like arrow functions,
  const/let, for-of with more coming soon.
* Same great features as otto, more modern environment for doodads!

Open Source Licenses.md

@@ -47,28 +47,24 @@ Except as contained in this notice, the name of Tavmjong Bah shall not be used i
 
 ## Go Modules
 
-### github.com/robertkrimen/otto
+### github.com/dop251/goja
 
 ```
+Copyright (c) 2016 Dmitry Panov
+
 Copyright (c) 2012 Robert Krimen
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
-of this software and associated documentation files (the "Software"), to deal
+documentation files (the "Software"), to deal in the Software without restriction, including without limitation
-in the Software without restriction, including without limitation the rights
+the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+permit persons to whom the Software is furnished to do so, subject to the following conditions:
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in all
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
 ```
 
 ### github.com/satori/go.uuid

dev-assets/doodads/azulian/azulian-red.js

@@ -1,43 +0,0 @@
-// Azulian (Red)
-// DEPRECATED: they both share azulian.js now.
-
-function main() {
-	var playerSpeed = 4;
-	var gravity = 4;
-	var Vx = Vy = 0;
-
-	var direction = "right";
-
-	Self.SetHitbox(0, 0, 32, 32)
-	Self.SetMobile(true);
-	Self.SetInventory(true);
-	Self.SetGravity(true);
-	Self.AddAnimation("walk-left", 100, ["red-wl1", "red-wl2", "red-wl3", "red-wl4"]);
-	Self.AddAnimation("walk-right", 100, ["red-wr1", "red-wr2", "red-wr3", "red-wr4"]);
-
-	// Sample our X position every few frames and detect if we've hit a solid wall.
-	var sampleTick = 0;
-	var sampleRate = 5;
-	var lastSampledX = 0;
-
-	setInterval(function () {
-		if (sampleTick % sampleRate === 0) {
-			var curX = Self.Position().X;
-			var delta = Math.abs(curX - lastSampledX);
-			if (delta < 5) {
-				direction = direction === "right" ? "left" : "right";
-			}
-			lastSampledX = curX;
-		}
-		sampleTick++;
-
-		// TODO: Vector() requires floats, pain in the butt for JS,
-		// the JS API should be friendlier and custom...
-		var Vx = parseFloat(playerSpeed * (direction === "left" ? -1 : 1));
-		Self.SetVelocity(Vector(Vx, 0.0));
-
-		if (!Self.IsAnimating()) {
-			Self.PlayAnimation("walk-" + direction, null);
-		}
-	}, 100);
-}

dev-assets/doodads/azulian/azulian.js

@@ -5,7 +5,7 @@ var playerSpeed = 12,
 	lastDirection = "right";
 
 function setupAnimations(color) {
-	var left = color === 'blue' ? 'blu-wl' : 'red-wl',
+	let left = color === 'blue' ? 'blu-wl' : 'red-wl',
 		right = color === 'blue' ? 'blu-wr' : 'red-wr',
 		leftFrames = [left + '1', left + '2', left + '3', left + '4'],
 		rightFrames = [right + '1', right + '2', right + '3', right + '4'];
@@ -15,7 +15,7 @@ function setupAnimations(color) {
 }
 
 function main() {
-	var color = Self.GetTag("color");
+	const color = Self.GetTag("color");
 	playerSpeed = color === 'blue' ? 2 : 4;
 
 	Self.SetMobile(true);
@@ -32,14 +32,14 @@ function main() {
 	// when it meets resistance.
 
 	// Sample our X position every few frames and detect if we've hit a solid wall.
-	var sampleTick = 0;
+	let sampleTick = 0;
-	var sampleRate = 5;
+	let sampleRate = 5;
-	var lastSampledX = 0;
+	let lastSampledX = 0;
 
-	setInterval(function () {
+	setInterval(() => {
 		if (sampleTick % sampleRate === 0) {
-			var curX = Self.Position().X;
+			let curX = Self.Position().X;
-			var delta = Math.abs(curX - lastSampledX);
+			let delta = Math.abs(curX - lastSampledX);
 			if (delta < 5) {
 				direction = direction === "right" ? "left" : "right";
 			}
@@ -47,7 +47,7 @@ function main() {
 		}
 		sampleTick++;
 
-		var Vx = parseFloat(playerSpeed * (direction === "left" ? -1 : 1));
+		let Vx = parseFloat(playerSpeed * (direction === "left" ? -1 : 1));
 		Self.SetVelocity(Vector(Vx, 0.0));
 
 		// If we changed directions, stop animating now so we can
@@ -66,7 +66,7 @@ function main() {
 
 function playerControls() {
 	// Note: player speed is controlled by the engine.
-	Events.OnKeypress(function (ev) {
+	Events.OnKeypress((ev) => {
 		if (ev.Right) {
 			if (!Self.IsAnimating()) {
 				Self.PlayAnimation("walk-right", null);

dev-assets/doodads/bird/bird.js

@@ -1,17 +1,17 @@
 // Bird
 
 function main() {
-	var speed = 4;
+	let speed = 4,
-	var Vx = Vy = 0;
+		Vx = Vy = 0,
-	var altitude = Self.Position().Y; // original height in the level
+		altitude = Self.Position().Y; // original height in the level
 
-	var direction = "left",
+	let direction = "left",
 		lastDirection = "left";
-	var states = {
+	let states = {
 		flying: 0,
 		diving: 1,
 	};
-	var state = states.flying;
+	let state = states.flying;
 
 	Self.SetMobile(true);
 	Self.SetGravity(false);
@@ -24,22 +24,22 @@ function main() {
 		return player();
 	}
 
-	Events.OnCollide(function (e) {
+	Events.OnCollide((e) => {
 		if (e.Actor.IsMobile() && e.InHitbox) {
 			return false;
 		}
 	});
 
 	// Sample our X position every few frames and detect if we've hit a solid wall.
-	var sampleTick = 0;
+	let sampleTick = 0,
-	var sampleRate = 2;
+		sampleRate = 2,
-	var lastSampledX = 0;
+		lastSampledX = 0,
-	var lastSampledY = 0;
+		lastSampledY = 0;
 
-	setInterval(function () {
+	setInterval(() => {
 		if (sampleTick % sampleRate === 0) {
-			var curX = Self.Position().X;
+			let curX = Self.Position().X;
-			var delta = Math.abs(curX - lastSampledX);
+			let delta = Math.abs(curX - lastSampledX);
 			if (delta < 5) {
 				direction = direction === "right" ? "left" : "right";
 			}
@@ -48,15 +48,15 @@ function main() {
 		sampleTick++;
 
 		// If we are not flying at our original altitude, correct for that.
-		var curV = Self.Position();
+		let curV = Self.Position();
-		var Vy = 0.0;
+		let Vy = 0.0;
 		if (curV.Y != altitude) {
 			Vy = curV.Y < altitude ? 1 : -1;
 		}
 
 		// TODO: Vector() requires floats, pain in the butt for JS,
 		// the JS API should be friendlier and custom...
-		var Vx = parseFloat(speed * (direction === "left" ? -1 : 1));
+		let Vx = parseFloat(speed * (direction === "left" ? -1 : 1));
 		Self.SetVelocity(Vector(Vx, Vy));
 
 		// If we changed directions, stop animating now so we can
@@ -76,7 +76,7 @@ function main() {
 // If under control of the player character.
 function player() {
 	Self.SetInventory(true);
-	Events.OnKeypress(function (ev) {
+	Events.OnKeypress((ev) => {
 		Vx = 0;
 		Vy = 0;
 

dev-assets/doodads/box/box.js

@@ -1,20 +1,21 @@
 // Pushable Box.
-var speed = 4;
+
-var size = 75;
+const speed = 4,
+    size = 75;
 
 function main() {
     Self.SetMobile(true);
     Self.SetGravity(true);
     Self.SetHitbox(0, 0, size, size);
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         // Ignore events from neighboring Boxes.
         if (e.Actor.Actor.Filename === "box.doodad") {
             return false;
         }
 
         if (e.Actor.IsMobile() && e.InHitbox) {
-            var overlap = e.Overlap;
+            let overlap = e.Overlap;
 
             if (overlap.Y === 0 && !(overlap.X === 0 && overlap.W < 5) && !(overlap.X === size)) {
                 // Standing on top, ignore.
@@ -39,8 +40,8 @@ function main() {
     });
 
     // When we receive power, we reset to our original position.
-    var origPoint = Self.Position();
+    let origPoint = Self.Position();
-    Message.Subscribe("power", function (powered) {
+    Message.Subscribe("power", (powered) => {
         Self.MoveTo(origPoint);
         Self.SetVelocity(Vector(0, 0));
     });
@@ -52,8 +53,8 @@ function main() {
 function animate() {
     Self.AddAnimation("animate", 100, [0, 1, 2, 3, 2, 1]);
 
-    var running = false;
+    let running = false;
-    setInterval(function () {
+    setInterval(() => {
         if (!running) {
             running = true;
             Self.PlayAnimation("animate", function () {

dev-assets/doodads/boy/boy.js

@@ -1,10 +1,10 @@
+const playerSpeed = 12;
+
+let Vx = Vy = 0,
+	animating = false,
+	animStart = animEnd = 0;
+
 function main() {
-	var playerSpeed = 12;
-	var Vx = Vy = 0;
-
-	var animating = false;
-	var animStart = animEnd = 0;
-
 	Self.SetMobile(true);
 	Self.SetInventory(true);
 	Self.SetGravity(true);
@@ -13,13 +13,13 @@ function main() {
 	Self.AddAnimation("walk-right", 200, ["stand-right", "walk-right-1", "walk-right-2", "walk-right-3", "walk-right-2", "walk-right-1"]);
 
 	// If the player suddenly changes direction, reset the animation state to quickly switch over.
-	var lastVelocity = Vector(0, 0);
+	let lastVelocity = Vector(0, 0);
 
-	Events.OnKeypress(function (ev) {
+	Events.OnKeypress((ev) => {
 		Vx = 0;
 		Vy = 0;
 
-		var curVelocity = Self.GetVelocity();
+		let curVelocity = Self.GetVelocity();
 		if ((lastVelocity.X < 0 && curVelocity.X > 0) ||
 			(lastVelocity.X > 0 && curVelocity.X < 0)) {
 			Self.StopAnimation();
@@ -40,7 +40,5 @@ function main() {
 			Self.StopAnimation();
 			animating = false;
 		}
-
-		// Self.SetVelocity(Point(Vx, Vy));
 	})
 }

dev-assets/doodads/buttons/button.js

@@ -1,18 +1,18 @@
 function main() {
-	var timer = 0;
+	let timer = 0;
-	var pressed = false;
+	let pressed = false;
 
 	// Has a linked Sticky Button been pressed permanently down?
-	var stickyDown = false;
+	let stickyDown = false;
-	Message.Subscribe("sticky:down", function (down) {
+	Message.Subscribe("sticky:down", (down) => {
 		stickyDown = down;
 		Self.ShowLayer(stickyDown ? 1 : 0);
 	});
 
 	// Track who all is colliding with us.
-	var colliders = {};
+	let colliders = {};
 
-	Events.OnCollide(function (e) {
+	Events.OnCollide((e) => {
 		if (!e.Settled) {
 			return;
 		}
@@ -46,7 +46,7 @@ function main() {
 		Self.ShowLayer(1);
 	});
 
-	Events.OnLeave(function (e) {
+	Events.OnLeave((e) => {
 		delete colliders[e.Actor.ID()];
 
 		if (Object.keys(colliders).length === 0 && !stickyDown) {

dev-assets/doodads/buttons/sticky.js

@@ -1,8 +1,8 @@
 function main() {
-	var pressed = false;
+	let pressed = false;
 
 	// When a sticky button receives power, it pops back up.
-	Message.Subscribe("power", function (powered) {
+	Message.Subscribe("power", (powered) => {
 		if (powered && pressed) {
 			Self.ShowLayer(0);
 			pressed = false;
@@ -12,7 +12,7 @@ function main() {
 		}
 	})
 
-	Events.OnCollide(function (e) {
+	Events.OnCollide((e) => {
 		if (!e.Settled) {
 			return;
 		}

dev-assets/doodads/crumbly-floor/crumbly-floor.js

@@ -6,19 +6,16 @@ function main() {
 	Self.AddAnimation("fall", 100, ["fall1", "fall2", "fall3", "fall4"]);
 
 	// Recover time for the floor to respawn.
-	var recover = 5000;
+	let recover = 5000;
 
 	// States of the floor.
-	var stateSolid = 0;
+	let stateSolid = 0;
-	var stateShaking = 1;
+	let stateShaking = 1;
-	var stateFalling = 2;
+	let stateFalling = 2;
-	var stateFallen = 3;
+	let stateFallen = 3;
-	var state = stateSolid;
+	let state = stateSolid;
 
-	// Started the animation?
+	Events.OnCollide((e) => {
-	var startedAnimation = false;
-
-	Events.OnCollide(function(e) {
 
 		// If the floor is falling, the player passes right thru.
 		if (state === stateFalling || state === stateFallen) {
@@ -40,15 +37,15 @@ function main() {
 			// Begin the animation sequence if we're in the solid state.
 			if (state === stateSolid) {
 				state = stateShaking;
-				Self.PlayAnimation("shake", function() {
+				Self.PlayAnimation("shake", () => {
 					state = stateFalling;
-					Self.PlayAnimation("fall", function() {
+					Self.PlayAnimation("fall", () => {
 						Sound.Play("crumbly-break.wav")
 						state = stateFallen;
 						Self.ShowLayerNamed("fallen");
 
 						// Recover after a while.
-						setTimeout(function() {
+						setTimeout(() => {
 							Self.ShowLayer(0);
 							state = stateSolid;
 						}, recover);

dev-assets/doodads/doors/colored-door.js

@@ -1,9 +1,11 @@
-function main() {
+// Colored Locked Doors.
-	var color = Self.GetTag("color");
-	var keyname = color === "small" ? "small-key.doodad" : "key-" + color + ".doodad";
 
+const color = Self.GetTag("color"),
+	keyname = color === "small" ? "small-key.doodad" : "key-" + color + ".doodad";
+
+function main() {
 	// Layers in the doodad image.
-	var layer = {
+	let layer = {
 		closed: 0,
 		unlocked: 1,
 		right: 2,
@@ -11,13 +13,13 @@ function main() {
 	};
 
 	// Variables that change in event handler.
-	var unlocked = false;  // Key has been used to unlock the door (one time).
+	let unlocked = false;  // Key has been used to unlock the door (one time).
-	var opened = false;    // If door is currently showing its opened state.
+	let opened = false;    // If door is currently showing its opened state.
-	var enterSide = 0;     // Side of player entering the door, -1 or 1, left or right.
+	let enterSide = 0;     // Side of player entering the door, -1 or 1, left or right.
 
 	Self.SetHitbox(34, 0, 13, 76);
 
-	Events.OnCollide(function(e) {
+	Events.OnCollide((e) => {
 		// Record the side that this actor has touched us, in case the door
 		// needs to open.
 		if (enterSide === 0) {
@@ -37,7 +39,7 @@ function main() {
 			}
 
 			// Do they have our key?
-			var hasKey = e.Actor.HasItem(keyname) >= 0;
+			let hasKey = e.Actor.HasItem(keyname) >= 0;
 			if (!hasKey) {
 				// Door is locked.
 				return false;
@@ -55,7 +57,7 @@ function main() {
 			}
 		}
 	});
-	Events.OnLeave(function(e) {
+	Events.OnLeave((e) => {
 		Self.ShowLayer(unlocked ? layer.unlocked : layer.closed);
 		// Sound.Play("door-close.wav")
 

dev-assets/doodads/doors/electric-door.js

@@ -1,6 +1,8 @@
-var animating = false;
+// Electric Door
-var opened = false;
+
-var powerState = false;
+let animating = false;
+let opened = false;
+let powerState = false;
 
 // Function to handle the door opening or closing.
 function setPoweredState(powered) {
@@ -13,14 +15,14 @@ function setPoweredState(powered) {
 
 		animating = true;
 		Sound.Play("electric-door.wav")
-		Self.PlayAnimation("open", function () {
+		Self.PlayAnimation("open", () => {
 			opened = true;
 			animating = false;
 		});
 	} else {
 		animating = true;
 		Sound.Play("electric-door.wav")
-		Self.PlayAnimation("close", function () {
+		Self.PlayAnimation("close", () => {
 			opened = false;
 			animating = false;
 		})
@@ -31,7 +33,6 @@ function main() {
 	Self.AddAnimation("open", 100, [0, 1, 2, 3]);
 	Self.AddAnimation("close", 100, [3, 2, 1, 0]);
 
-
 	Self.SetHitbox(0, 0, 34, 76);
 
 	// A linked Switch that activates the door will send the Toggle signal
@@ -39,13 +40,13 @@ function main() {
 	// state on this signal, and ignore the very next Power signal. Ordinary
 	// power sources like Buttons will work as normal, as they emit only a power
 	// signal.
-	var ignoreNextPower = false;
+	let ignoreNextPower = false;
-	Message.Subscribe("switch:toggle", function (powered) {
+	Message.Subscribe("switch:toggle", (powered) => {
 		ignoreNextPower = true;
 		setPoweredState(!powerState);
 	})
 
-	Message.Subscribe("power", function (powered) {
+	Message.Subscribe("power", (powered) => {
 		if (ignoreNextPower) {
 			ignoreNextPower = false;
 			return;
@@ -54,7 +55,7 @@ function main() {
 		setPoweredState(powered);
 	});
 
-	Events.OnCollide(function (e) {
+	Events.OnCollide((e) => {
 		if (e.InHitbox) {
 			if (!opened) {
 				return false;

dev-assets/doodads/doors/keys.js

@@ -1,8 +1,10 @@
-function main() {
+// Colored Keys and Small Key
-	var color = Self.GetTag("color");
-	var quantity = color === "small" ? 1 : 0;
 
-	Events.OnCollide(function (e) {
+const color = Self.GetTag("color"),
+	quantity = color === "small" ? 1 : 0;
+
+function main() {
+	Events.OnCollide((e) => {
 		if (e.Settled) {
 			if (e.Actor.HasInventory()) {
 				// If we don't have a quantity, and the actor already has

dev-assets/doodads/doors/locked-door.js

@@ -1,27 +0,0 @@
-// DEPRECATED: old locked door script. Superceded by colored-door.js.
-function main() {
-	Self.AddAnimation("open", 0, [1]);
-	var unlocked = false;
-	var color = Self.GetTag("color");
-
-	Self.SetHitbox(16, 0, 32, 64);
-
-	Events.OnCollide(function(e) {
-		if (unlocked) {
-			return;
-		}
-
-		if (e.InHitbox) {
-			var data = e.Actor.GetData("key:" + color);
-			if (data === "") {
-				// Door is locked.
-				return false;
-			}
-
-			if (e.Settled) {
-				unlocked = true;
-				Self.PlayAnimation("open", null);
-			}
-		}
-	});
-}

dev-assets/doodads/objects/anvil.js

@@ -8,9 +8,9 @@ function main() {
     Self.SetGravity(true);
 
     // Monitor our Y position to tell if we've been falling.
-    var lastPoint = Self.Position();
+    let lastPoint = Self.Position();
-    setInterval(function () {
+    setInterval(() => {
-        var nowAt = Self.Position();
+        let nowAt = Self.Position();
         if (nowAt.Y > lastPoint.Y) {
             falling = true;
         } else {
@@ -19,7 +19,7 @@ function main() {
         lastPoint = nowAt;
     }, 100);
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         if (!e.Settled) {
             return;
         }
@@ -43,8 +43,8 @@ function main() {
     });
 
     // When we receive power, we reset to our original position.
-    var origPoint = Self.Position();
+    let origPoint = Self.Position();
-    Message.Subscribe("power", function (powered) {
+    Message.Subscribe("power", (powered) => {
         Self.MoveTo(origPoint);
         Self.SetVelocity(Vector(0, 0));
     });

dev-assets/doodads/objects/checkpoint-flag.js

@@ -7,11 +7,11 @@ function main() {
 
     // Checkpoints broadcast to all of their peers so they all
     // know which one is the most recently activated.
-    Message.Subscribe("broadcast:checkpoint", function (currentID) {
+    Message.Subscribe("broadcast:checkpoint", (currentID) => {
         setActive(false);
     });
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         if (!e.Settled) {
             return;
         }

dev-assets/doodads/objects/exit-flag.js

@@ -2,7 +2,7 @@
 function main() {
 	Self.SetHitbox(22 + 16, 16, 75 - 16, 86);
 
-	Events.OnCollide(function (e) {
+	Events.OnCollide((e) => {
 		if (!e.Settled) {
 			return;
 		}

dev-assets/doodads/objects/start-flag.js

@@ -4,8 +4,7 @@ function main() {
 
     // Linking a doodad to the Start Flag sets the
     // player character. Destroy the original doodads.
-    var links = Self.GetLinks();
+    for (var link of Self.GetLinks()) {
-    for (var i = 0; i < links.length; i++) {
+        link.Destroy();
-        links[i].Destroy();
     }
 }

dev-assets/doodads/on-off/state-block-blue.js

@@ -3,9 +3,9 @@ function main() {
 	Self.SetHitbox(0, 0, 42, 42);
 
 	// Blue block is ON by default.
-	var state = true;
+	let state = true;
 
-	Message.Subscribe("broadcast:state-change", function(newState) {
+	Message.Subscribe("broadcast:state-change", (newState) => {
 		state = !newState;
 
 		// Layer 0: ON
@@ -13,7 +13,7 @@ function main() {
 		Self.ShowLayer(state ? 0 : 1);
 	});
 
-	Events.OnCollide(function(e) {
+	Events.OnCollide((e) => {
 		if (e.Actor.IsMobile() && e.InHitbox) {
 			if (state) {
 				return false;

dev-assets/doodads/on-off/state-block-orange.js

@@ -3,9 +3,9 @@ function main() {
 	Self.SetHitbox(0, 0, 42, 42);
 
 	// Orange block is OFF by default.
-	var state = false;
+	let state = false;
 
-	Message.Subscribe("broadcast:state-change", function(newState) {
+	Message.Subscribe("broadcast:state-change", (newState) => {
 		state = newState;
 
 		// Layer 0: OFF
@@ -13,7 +13,7 @@ function main() {
 		Self.ShowLayer(state ? 1 : 0);
 	});
 
-	Events.OnCollide(function(e) {
+	Events.OnCollide((e) => {
 		if (e.Actor.IsMobile() && e.InHitbox) {
 			if (state) {
 				return false;

dev-assets/doodads/on-off/state-button.js

@@ -1,23 +1,23 @@
 // State Block Control Button
 
 // Button is "OFF" by default.
-var state = false;
+let state = false;
 
 function main() {
 	Self.SetHitbox(0, 0, 42, 42);
 
 	// When the button is activated, don't keep toggling state until we're not
 	// being touched again.
-	var colliding = false;
+	let colliding = false;
 
 	// If we receive a state change event from a DIFFERENT on/off button, update
 	// ourself to match the state received.
-	Message.Subscribe("broadcast:state-change", function(value) {
+	Message.Subscribe("broadcast:state-change", (value) => {
 		state = value;
 		showSprite();
 	});
 
-	Events.OnCollide(function(e) {
+	Events.OnCollide((e) => {
 		if (colliding) {
 			return false;
 		}
@@ -40,7 +40,7 @@ function main() {
 		return false;
 	});
 
-	Events.OnLeave(function(e) {
+	Events.OnLeave((e) => {
 		colliding = false;
 	})
 }

dev-assets/doodads/regions/checkpoint.js

@@ -8,11 +8,11 @@ function main() {
 
     // Checkpoints broadcast to all of their peers so they all
     // know which one is the most recently activated.
-    Message.Subscribe("broadcast:checkpoint", function (currentID) {
+    Message.Subscribe("broadcast:checkpoint", (currentID) => {
         setActive(false);
     });
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         if (isCurrentCheckpoint || !e.Settled) {
             return;
         }

dev-assets/doodads/regions/fire.js

@@ -2,7 +2,7 @@
 function main() {
     Self.Hide();
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         if (!e.Settled) {
             return;
         }

dev-assets/doodads/regions/goal.js

@@ -2,7 +2,7 @@
 function main() {
     Self.Hide();
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         if (!e.Settled) {
             return;
         }

dev-assets/doodads/regions/power.js

@@ -15,7 +15,7 @@ function main() {
         );
     }
 
-    Message.Subscribe("broadcast:ready", function () {
+    Message.Subscribe("broadcast:ready", () => {
         Message.Publish("switch:toggle", true);
         Message.Publish("power", true);
     });

dev-assets/doodads/regions/stall.js

@@ -4,7 +4,7 @@
 function main() {
     Self.Hide();
 
-    var active = true,
+    let active = true,
         timeout = 250,
         ms = Self.GetTag("ms");
 
@@ -12,7 +12,7 @@ function main() {
         timeout = parseInt(ms);
     }
 
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
         if (!active || !e.Settled) {
             return;
         }
@@ -25,7 +25,7 @@ function main() {
         if (e.InHitbox) {
             // Grab hold of the player.
             e.Actor.Freeze();
-            setTimeout(function () {
+            setTimeout(() => {
                 e.Actor.Unfreeze();
             }, timeout);
 
@@ -34,7 +34,7 @@ function main() {
     });
 
     // Reset the trap if powered by a button.
-    Message.Subscribe("power", function (powered) {
+    Message.Subscribe("power", (powered) => {
         active = true;
     });
 }

dev-assets/doodads/switches/switch.js

@@ -4,15 +4,15 @@ function main() {
 	// 0: Off
 	// 1: On
 
-	var state = false;
+	let state = false;
-	var collide = false;
+	let collide = false;
 
-	Message.Subscribe("power", function (powered) {
+	Message.Subscribe("power", (powered) => {
 		state = powered;
 		showState(state);
 	});
 
-	Events.OnCollide(function (e) {
+	Events.OnCollide((e) => {
 		if (!e.Settled || !e.Actor.IsMobile()) {
 			return;
 		}
@@ -21,7 +21,6 @@ function main() {
 			Sound.Play("button-down.wav")
 			state = !state;
 
-			var nonce = Math.random() * 2147483647;
 			Message.Publish("switch:toggle", state);
 			Message.Publish("power", state);
 			showState(state);
@@ -30,7 +29,7 @@ function main() {
 		}
 	});
 
-	Events.OnLeave(function (e) {
+	Events.OnLeave((e) => {
 		collide = false;
 	});
 }

dev-assets/doodads/thief/thief.js

@@ -21,8 +21,8 @@ function main() {
 // Common "steal" power between playable and A.I. thieves.
 function stealable() {
     // Steals your items.
-    Events.OnCollide(function (e) {
+    Events.OnCollide((e) => {
-        var victim = e.Actor;
+        let victim = e.Actor;
         if (!e.Settled) {
             return;
         }
@@ -33,17 +33,17 @@ function stealable() {
         }
 
         // Steal inventory
-        var stolen = 0;
+        let stolen = 0;
         if (victim.HasInventory()) {
-            var myInventory = Self.Inventory(),
+            let myInventory = Self.Inventory(),
                 theirInventory = victim.Inventory();
 
-            for (var key in theirInventory) {
+            for (let key in theirInventory) {
                 if (!theirInventory.hasOwnProperty(key)) {
                     continue;
                 }
 
-                var value = theirInventory[key];
+                let value = theirInventory[key];
                 if (value > 0 || myInventory[key] === undefined) {
                     victim.RemoveItem(key, value);
                     Self.AddItem(key, value);
@@ -68,7 +68,7 @@ function stealable() {
 // when it encounters and obstacle.
 function ai() {
     // Walks back and forth.
-    var Vx = Vy = 0.0,
+    let Vx = Vy = 0.0,
         playerSpeed = 4,
         direction = "right",
         lastDirection = "right",
@@ -76,9 +76,9 @@ function ai() {
         sampleTick = 0,
         sampleRate = 2;
 
-    setInterval(function () {
+    setInterval(() => {
         if (sampleTick % sampleRate === 0) {
-            var curX = Self.Position().X,
+            let curX = Self.Position().X,
                 delta = Math.abs(curX - lastSampledX);
             if (delta < 5) {
                 direction = direction === "right" ? "left" : "right";
@@ -106,7 +106,7 @@ function ai() {
 
 // If under control of the player character.
 function playable() {
-    Events.OnKeypress(function (ev) {
+    Events.OnKeypress((ev) => {
         Vx = 0;
         Vy = 0;
 

dev-assets/doodads/trapdoors/down.js

@@ -1,36 +0,0 @@
-function main() {
-	var timer = 0;
-
-	Self.SetHitbox(0, 0, 72, 6);
-
-	var animationSpeed = 100;
-	var opened = false;
-	Self.AddAnimation("open", animationSpeed, ["down1", "down2", "down3", "down4"]);
-	Self.AddAnimation("close", animationSpeed, ["down4", "down3", "down2", "down1"]);
-
-	Events.OnCollide( function(e) {
-		if (opened) {
-			return;
-		}
-
-		// Is the actor colliding our solid part?
-		if (e.InHitbox) {
-			// Touching the top or the bottom?
-			if (e.Overlap.Y > 0) {
-				return false; // solid wall when touched from below
-			} else {
-				opened = true;
-				Self.PlayAnimation("open", function() {
-				});
-			}
-		}
-	});
-
-	Events.OnLeave(function() {
-		if (opened) {
-			Self.PlayAnimation("close", function() {
-				opened = false;
-			});
-		}
-	})
-}

dev-assets/doodads/trapdoors/trapdoor.js

@@ -1,12 +1,12 @@
+// Trapdoors.
+
+// What direction is the trapdoor facing?
+const direction = Self.GetTag("direction");
+
 function main() {
-	// What direction is the trapdoor facing?
-	var direction = Self.GetTag("direction");
-
-	var timer = 0;
-
 	// Set our hitbox based on our orientation.
-	var thickness = 10;
+	let thickness = 10;
-	var doodadSize = 86;
+	let doodadSize = 86;
 	if (direction === "left") {
 		Self.SetHitbox(48, 0, doodadSize, doodadSize);
 	} else if (direction === "right") {
@@ -17,12 +17,12 @@ function main() {
 		Self.SetHitbox(0, 0, doodadSize, thickness);
 	}
 
-	var animationSpeed = 100;
+	let animationSpeed = 100;
-	var opened = false;
+	let opened = false;
 
 	// Register our animations.
-	var frames = [];
+	let frames = [];
-	for (var i = 1; i <= 4; i++) {
+	for (let i = 1; i <= 4; i++) {
 		frames.push(direction + i);
 	}
 
@@ -30,7 +30,7 @@ function main() {
 	frames.reverse();
 	Self.AddAnimation("close", animationSpeed, frames);
 
-	Events.OnCollide( function(e) {
+	Events.OnCollide((e) => {
 		if (opened) {
 			return;
 		}
@@ -78,9 +78,9 @@ function main() {
 		}
 	});
 
-	Events.OnLeave(function() {
+	Events.OnLeave(() => {
 		if (opened) {
-			Self.PlayAnimation("close", function() {
+			Self.PlayAnimation("close", () => {
 				opened = false;
 			});
 		}

dev-assets/doodads/warp-door/warp-door.js

@@ -1,16 +1,17 @@
 // Warp Doors
+
+const color = Self.GetTag("color"),
+	isStateDoor = color === 'blue' || color === 'orange';
+
+// State in case we're a blue warp door.
+let state = color === 'blue',
+	animating = false,
+	collide = false;
+
 function main() {
-	// Are we a blue or orange door? Regular warp door will be 'none'
-	var color = Self.GetTag("color");
-	var isStateDoor = color === 'blue' || color === 'orange';
-	var state = color === 'blue';  // Blue door is ON by default.
-
-	var animating = false;
-	var collide = false;
-
 	// Declare animations and sprite names.
-	var animSpeed = 100;
+	let animSpeed = 100;
-	var spriteDefault, spriteDisabled;  // the latter for state doors.
+	let spriteDefault, spriteDisabled;  // the latter for state doors.
 	if (color === 'blue') {
 		Self.AddAnimation("open", animSpeed, ["blue-2", "blue-3", "blue-4"]);
 		Self.AddAnimation("close", animSpeed, ["blue-4", "blue-3", "blue-2", "blue-1"]);
@@ -33,17 +34,17 @@ function main() {
 	}
 
 	// Find our linked Warp Door.
-	var links = Self.GetLinks()
+	let linkedDoor = null;
-	var linkedDoor = null;
+	for (let link of Self.GetLinks()) {
-	for (var i = 0; i < links.length; i++) {
+		if (link.Title.indexOf("Warp Door") > -1) {
-		if (links[i].Title.indexOf("Warp Door") > -1) {
+			linkedDoor = link;
-			linkedDoor = links[i];
+			break;
 		}
 	}
 
 	// Subscribe to the global state-change if we are a state door.
 	if (isStateDoor) {
-		Message.Subscribe("broadcast:state-change", function(newState) {
+		Message.Subscribe("broadcast:state-change", (newState) => {
 			state = color === 'blue' ? !newState : newState;
 
 			// Activate or deactivate the door.
@@ -52,12 +53,11 @@ function main() {
 	}
 
 	// For player groundedness work-around
-	var playerLastY = []; // last sampling of Y values
+	let playerLastY = []; // last sampling of Y values
-	var lastUsed = time.Now();
 
 	// The player Uses the door.
-	var flashedCooldown = false; // "Locked Door" flashed message.
+	let flashedCooldown = false; // "Locked Door" flashed message.
-	Events.OnUse(function(e) {
+	Events.OnUse((e) => {
 		if (animating) {
 			return;
 		}
@@ -86,7 +86,7 @@ function main() {
 				// Work-around: if two Boxes are stacked atop each other the player can
 				// get stuck if he jumps on top. He may not be Grounded but isn't changing
 				// effective Y position and a warp door may work as a good way out.
-				var yValue = e.Actor.Position().Y;
+				let yValue = e.Actor.Position().Y;
 
 				// Collect a sampling of last few Y values. If the player Y position
 				// is constant the last handful of frames, treat them as if they're
@@ -100,8 +100,8 @@ function main() {
 				playerLastY.pop();
 
 				// Hasn't moved?
-				var isGrounded = true;
+				let isGrounded = true;
-				for (var i = 0; i < playerLastY.length; i++) {
+				for (let i = 0; i < playerLastY.length; i++) {
 					if (yValue !== playerLastY[i]) {
 						isGrounded = false;
 						break;
@@ -120,9 +120,9 @@ function main() {
 
 			// Play the open and close animation.
 			animating = true;
-			Self.PlayAnimation("open", function() {
+			Self.PlayAnimation("open", () => {
 				e.Actor.Hide()
-				Self.PlayAnimation("close", function() {
+				Self.PlayAnimation("close", () => {
 					Self.ShowLayerNamed(isStateDoor && !state ? spriteDisabled : spriteDefault);
 					animating = false;
 
@@ -139,12 +139,12 @@ function main() {
 	});
 
 	// Respond to incoming warp events.
-	Message.Subscribe("warp-door:incoming", function(player) {
+	Message.Subscribe("warp-door:incoming", (player) => {
 		animating = true;
 		player.Unfreeze();
-		Self.PlayAnimation("open", function() {
+		Self.PlayAnimation("open", () => {
 			player.Show();
-			Self.PlayAnimation("close", function() {
+			Self.PlayAnimation("close", () => {
 				animating = false;
 
 				// If the receiving door was a State Door, fix its state.

go.mod

@@ -10,12 +10,13 @@ require (
 	github.com/aichaos/rivescript-go v0.3.1
 	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
+	github.com/dop251/goja v0.0.0-20220110113543-261677941f3c
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gen2brain/dlgs v0.0.0-20211108104213-bade24837f0b
 	github.com/google/uuid v1.3.0
 	github.com/gopherjs/gopherjs v0.0.0-20220104163920-15ed2e8cf2bd // indirect
 	github.com/kirsle/configdir v0.0.0-20170128060238-e45d2f54772f
-	github.com/robertkrimen/otto v0.0.0-20211024170158-b87d35c0b86f
+	github.com/robertkrimen/otto v0.0.0-20211024170158-b87d35c0b86f // indirect
 	github.com/tomnomnom/xtermcolor v0.0.0-20160428124646-b78803f00a7e // indirect
 	github.com/urfave/cli/v2 v2.3.0
 	github.com/veandco/go-sdl2 v0.4.10

go.sum

@@ -69,11 +69,16 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:ma
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
 github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dlclark/regexp2 v1.4.1-0.20201116162257-a2a8dda75c91 h1:Izz0+t1Z5nI16/II7vuEo/nHjodOg0p7+OiDpjX5t1E=
+github.com/dlclark/regexp2 v1.4.1-0.20201116162257-a2a8dda75c91/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
+github.com/dop251/goja v0.0.0-20220110113543-261677941f3c h1:1XnAlcjYBdO7xsa2rhNB/BTztiu4cFKOxE+3brXVtG4=
+github.com/dop251/goja v0.0.0-20220110113543-261677941f3c/go.mod h1:R9ET47fwRVRPZnOGvHxxhuZcbrMCuiqOz3Rlrh4KSnk=
+github.com/dop251/goja_nodejs v0.0.0-20210225215109-d91c329300e7/go.mod h1:hn7BA7c8pLvoGndExHudxTDKZ84Pyvv+90pbBjbTz0Y=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -91,6 +96,8 @@ github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeME
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/go-sourcemap/sourcemap v2.1.3+incompatible h1:W1iEw64niKVGogNgBN3ePyLFfuisuzeidWPMPWmECqU=
+github.com/go-sourcemap/sourcemap v2.1.3+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
 github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
@@ -196,8 +203,10 @@ github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/magiconair/properties v1.8.5/go.mod h1:y3VJvCyxH9uVvJTWEGAELF3aiYNyPKd5NZ3oSwXrF60=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
@@ -227,7 +236,6 @@ github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FI
 github.com/pelletier/go-toml v1.9.3/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
@@ -259,7 +267,6 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/tomnomnom/xtermcolor v0.0.0-20160428124646-b78803f00a7e h1:Ee+VZw13r9NTOMnwTPs6O5KZ0MJU54hsxu9FpZ4pQ10=
@@ -459,6 +466,7 @@ golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -624,6 +632,7 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
@@ -640,7 +649,6 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

pkg/commands.go

@@ -14,7 +14,7 @@ import (
 	"git.kirsle.net/apps/doodle/pkg/enum"
 	"git.kirsle.net/apps/doodle/pkg/log"
 	"git.kirsle.net/apps/doodle/pkg/modal"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // Command is a parsed shell command.
@@ -330,13 +330,13 @@ func (c Command) BoolProp(d *Doodle) error {
 }
 
 // RunScript evaluates some JavaScript code safely.
-func (c Command) RunScript(d *Doodle, code interface{}) (otto.Value, error) {
+func (c Command) RunScript(d *Doodle, code string) (goja.Value, error) {
 	defer func() {
 		if err := recover(); err != nil {
 			d.FlashError("Command.RunScript: Panic: %s", err)
 		}
 	}()
-	out, err := d.shell.js.Run(code)
+	out, err := d.shell.js.RunString(code)
 	return out, err
 }
 

pkg/editor_ui_menubar.go

@@ -79,7 +79,7 @@ func (u *EditorUI) SetupMenuBar(d *Doodle) *ui.MenuBar {
 
 	fileMenu.AddItemAccel("Open...", "Ctrl-O", u.Scene.MenuOpen)
 	fileMenu.AddSeparator()
-	fileMenu.AddItem("Quit to menu", func() {
+	fileMenu.AddItem("Exit to menu", func() {
 		u.Scene.ConfirmUnload(func() {
 			d.Goto(&MainScene{})
 		})

pkg/scripting/events.go

@@ -2,10 +2,11 @@ package scripting
 
 import (
 	"errors"
+	"fmt"
 	"sync"
 
 	"git.kirsle.net/apps/doodle/pkg/keybind"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // Event name constants.
@@ -26,19 +27,21 @@ var (
 
 // Events API for Doodad scripts.
 type Events struct {
-	registry map[string][]otto.Value
+	runtime  *goja.Runtime
+	registry map[string][]goja.Value
 	lock     sync.RWMutex
 }
 
 // NewEvents initializes the Events API.
-func NewEvents() *Events {
+func NewEvents(runtime *goja.Runtime) *Events {
 	return &Events{
-		registry: map[string][]otto.Value{},
+		runtime:  runtime,
+		registry: map[string][]goja.Value{},
 	}
 }
 
 // OnCollide fires when another actor collides with yours.
-func (e *Events) OnCollide(call otto.FunctionCall) otto.Value {
+func (e *Events) OnCollide(call goja.FunctionCall) goja.Value {
 	return e.register(CollideEvent, call.Argument(0))
 }
 
@@ -48,7 +51,7 @@ func (e *Events) RunCollide(v interface{}) error {
 }
 
 // OnUse fires when another actor collides with yours.
-func (e *Events) OnUse(call otto.FunctionCall) otto.Value {
+func (e *Events) OnUse(call goja.FunctionCall) goja.Value {
 	return e.register(UseEvent, call.Argument(0))
 }
 
@@ -58,7 +61,7 @@ func (e *Events) RunUse(v interface{}) error {
 }
 
 // OnLeave fires when another actor stops colliding with yours.
-func (e *Events) OnLeave(call otto.FunctionCall) otto.Value {
+func (e *Events) OnLeave(call goja.FunctionCall) goja.Value {
 	return e.register(LeaveEvent, call.Argument(0))
 }
 
@@ -68,30 +71,26 @@ func (e *Events) RunLeave(v interface{}) error {
 }
 
 // OnKeypress fires when another actor collides with yours.
-func (e *Events) OnKeypress(call otto.FunctionCall) otto.Value {
+func (e *Events) OnKeypress(call goja.FunctionCall) goja.Value {
 	return e.register(KeypressEvent, call.Argument(0))
 }
 
 // RunKeypress invokes the OnCollide handler function.
 func (e *Events) RunKeypress(ev keybind.State) error {
-	return e.run(KeypressEvent, ev)
+	return e.run(KeypressEvent, e.runtime.ToValue(ev))
 }
 
 // register a named event.
-func (e *Events) register(name string, callback otto.Value) otto.Value {
+func (e *Events) register(name string, callback goja.Value) goja.Value {
-	if !callback.IsFunction() {
-		return otto.Value{} // TODO
-	}
-
 	e.lock.Lock()
 	defer e.lock.Unlock()
 
 	if _, ok := e.registry[name]; !ok {
-		e.registry[name] = []otto.Value{}
+		e.registry[name] = []goja.Value{}
 	}
 
 	e.registry[name] = append(e.registry[name], callback)
-	return otto.Value{}
+	return goja.Undefined()
 }
 
 // Run an event handler. Returns an error only if there was a JavaScript error
@@ -104,20 +103,28 @@ func (e *Events) run(name string, args ...interface{}) error {
 		return nil
 	}
 
+	var params = make([]goja.Value, len(args))
+	for i, v := range args {
+		params[i] = e.runtime.ToValue(v)
+	}
+
 	for _, callback := range e.registry[name] {
-		value, err := callback.Call(otto.Value{}, args...)
+		function, ok := goja.AssertFunction(callback)
+		if !ok {
+			return fmt.Errorf("failed to callback %s: %s", name, callback)
+		}
+
+		value, err := function(goja.Undefined(), params...)
 		if err != nil {
 			return err
 		}
 
 		// If the event handler returned a boolean false, stop all other
 		// callbacks and return the boolean.
-		if value.IsBoolean() {
+		if b, ok := value.Export().(bool); ok && !b {
-			if b, err := value.ToBoolean(); err == nil && b == false {
 			return ErrReturnFalse
 		}
 	}
-	}
 
 	return nil
 }

pkg/scripting/pubsub.go

@@ -2,7 +2,7 @@ package scripting
 
 import (
 	"git.kirsle.net/apps/doodle/pkg/log"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // Message holds data being published from one script VM with information sent
@@ -10,7 +10,7 @@ import (
 type Message struct {
 	Name     string
 	SenderID string
-	Args     []interface{}
+	Args     []goja.Value
 }
 
 /*
@@ -29,7 +29,10 @@ func RegisterPublishHooks(s *Supervisor, vm *VM) {
 			if _, ok := vm.subscribe[msg.Name]; ok {
 				for _, callback := range vm.subscribe[msg.Name] {
 					log.Debug("PubSub: %s receives from %s: %s", vm.Name, msg.SenderID, msg.Name)
-					callback.Call(otto.Value{}, msg.Args...)
+					if function, ok := goja.AssertFunction(callback); ok {
+						result, err := function(goja.Undefined(), msg.Args...)
+						log.Debug("Result: %s, %s", result, err)
+					}
 				}
 			}
 
@@ -39,22 +42,22 @@ func RegisterPublishHooks(s *Supervisor, vm *VM) {
 
 	// Register the Message.Subscribe and Message.Publish functions.
 	vm.vm.Set("Message", map[string]interface{}{
-		"Subscribe": func(name string, callback otto.Value) {
+		"Subscribe": func(name string, callback goja.Value) {
 			vm.muSubscribe.Lock()
 			defer vm.muSubscribe.Unlock()
 
-			if !callback.IsFunction() {
+			if _, ok := goja.AssertFunction(callback); !ok {
 				log.Error("SUBSCRIBE(%s): callback is not a function", name)
 				return
 			}
 			if _, ok := vm.subscribe[name]; !ok {
-				vm.subscribe[name] = []otto.Value{}
+				vm.subscribe[name] = []goja.Value{}
 			}
 
 			vm.subscribe[name] = append(vm.subscribe[name], callback)
 		},
 
-		"Publish": func(name string, v ...interface{}) {
+		"Publish": func(name string, v ...goja.Value) {
 			for _, channel := range vm.Outbound {
 				channel <- Message{
 					Name:     name,
@@ -64,7 +67,7 @@ func RegisterPublishHooks(s *Supervisor, vm *VM) {
 			}
 		},
 
-		"Broadcast": func(name string, v ...interface{}) {
+		"Broadcast": func(name string, v ...goja.Value) {
 			// Send the message to all actor VMs.
 			for _, toVM := range s.scripts {
 				if vm.Name == toVM.Name {

pkg/scripting/timers.go

@@ -3,13 +3,13 @@ package scripting
 import (
 	"time"
 
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // Timer keeps track of delayed function calls for the scripting engine.
 type Timer struct {
 	id       int
-	callback otto.Value
+	callback goja.Value
 	interval time.Duration // milliseconds delay for timeout
 	next     time.Time     // scheduled time for next invocation
 	repeat   bool          // for setInterval
@@ -27,7 +27,7 @@ with 1000 being 'one second.'
 Returns the ID number of the timer in case you want to clear it. The underlying
 Timer type is NOT exposed to JavaScript.
 */
-func (vm *VM) SetTimeout(callback otto.Value, interval int) int {
+func (vm *VM) SetTimeout(callback goja.Value, interval int) int {
 	return vm.AddTimer(callback, interval, false)
 }
 
@@ -37,14 +37,14 @@ SetInterval registers a callback function to be run repeatedly.
 Returns the ID number of the timer in case you want to clear it. The underlying
 Timer type is NOT exposed to JavaScript.
 */
-func (vm *VM) SetInterval(callback otto.Value, interval int) int {
+func (vm *VM) SetInterval(callback goja.Value, interval int) int {
 	return vm.AddTimer(callback, interval, true)
 }
 
 /*
 AddTimer loads timeouts and intervals into the VM's memory and returns the ID.
 */
-func (vm *VM) AddTimer(callback otto.Value, interval int, repeat bool) int {
+func (vm *VM) AddTimer(callback goja.Value, interval int, repeat bool) int {
 	// Get the next timer ID. The first timer has ID 1.
 	vm.timerLastID++
 	id := vm.timerLastID
@@ -72,7 +72,10 @@ func (vm *VM) TickTimer(now time.Time) {
 
 	for id, timer := range vm.timers {
 		if now.After(timer.next) {
-			timer.callback.Call(otto.Value{})
+			if function, ok := goja.AssertFunction(timer.callback); ok {
+				function(goja.Undefined())
+			}
+
 			if timer.repeat {
 				timer.Schedule()
 			} else {

pkg/scripting/vm.go

@@ -1,11 +1,12 @@
 package scripting
 
 import (
+	"errors"
 	"fmt"
 	"sync"
 
 	"git.kirsle.net/apps/doodle/pkg/log"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // VM manages a single isolated JavaScript VM.
@@ -24,10 +25,10 @@ type VM struct {
 	//     messages.
 	Inbound     chan Message
 	Outbound    []chan Message
-	subscribe   map[string][]otto.Value // Subscribed message handlers by name.
+	subscribe   map[string][]goja.Value // Subscribed message handlers by name.
 	muSubscribe sync.RWMutex
 
-	vm *otto.Otto
+	vm *goja.Runtime
 
 	// setTimeout and setInterval variables.
 	timerLastID int // becomes 1 when first timer is set
@@ -38,21 +39,21 @@ type VM struct {
 func NewVM(name string) *VM {
 	vm := &VM{
 		Name:   name,
-		Events: NewEvents(),
+		vm:     goja.New(),
-		vm:     otto.New(),
 		timers: map[int]*Timer{},
 
 		// Pub/sub structs.
 		Inbound:   make(chan Message),
 		Outbound:  []chan Message{},
-		subscribe: map[string][]otto.Value{},
+		subscribe: map[string][]goja.Value{},
 	}
+	vm.Events = NewEvents(vm.vm)
 	return vm
 }
 
 // Run code in the VM.
-func (vm *VM) Run(src interface{}) (otto.Value, error) {
+func (vm *VM) Run(src string) (goja.Value, error) {
-	v, err := vm.vm.Run(src)
+	v, err := vm.vm.RunString(src)
 	return v, err
 }
 
@@ -78,13 +79,9 @@ func (vm *VM) RegisterLevelHooks() error {
 
 // Main calls the main function of the script.
 func (vm *VM) Main() error {
-	function, err := vm.vm.Get("main")
+	function, ok := goja.AssertFunction(vm.vm.Get("main"))
-	if err != nil {
+	if !ok {
-		return err
+		return errors.New("didn't find function main()")
-	}
-
-	if !function.IsFunction() {
-		return nil
 	}
 
 	// Catch panics.
@@ -94,6 +91,6 @@ func (vm *VM) Main() error {
 		}
 	}()
 
-	_, err = function.Call(otto.Value{})
+	_, err := function(goja.Undefined())
 	return err
 }

pkg/shell.go

@@ -14,7 +14,7 @@ import (
 	"git.kirsle.net/go/render"
 	"git.kirsle.net/go/render/event"
 	"git.kirsle.net/go/ui"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // Flash a message to the user.
@@ -59,7 +59,7 @@ type Shell struct {
 	historyIndex  int
 
 	// JavaScript shell interpreter.
-	js *otto.Otto
+	js *goja.Runtime
 }
 
 // Flash holds a message to flash on screen.
@@ -79,7 +79,7 @@ func NewShell(d *Doodle) Shell {
 		Prompt:     ">",
 		cursor:     '_',
 		cursorRate: balance.ShellCursorBlinkRate,
-		js:         otto.New(),
+		js:         goja.New(),
 	}
 
 	// Make the Doodle instance available to the shell.

pkg/uix/actor.go

@@ -12,8 +12,8 @@ import (
 	"git.kirsle.net/apps/doodle/pkg/log"
 	"git.kirsle.net/apps/doodle/pkg/physics"
 	"git.kirsle.net/go/render"
+	"github.com/dop251/goja"
 	"github.com/google/uuid"
-	"github.com/robertkrimen/otto"
 )
 
 // Actor is an object that marries together the three things that make a
@@ -52,7 +52,7 @@ type Actor struct {
 	// Animation variables.
 	animations        map[string]*Animation
 	activeAnimation   *Animation
-	animationCallback otto.Value
+	animationCallback goja.Value
 
 	// Mutex.
 	muInventory sync.RWMutex

pkg/uix/actor_animation.go

@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"git.kirsle.net/apps/doodle/pkg/log"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // Animation holds a named animation for a doodad script.
@@ -103,7 +103,7 @@ func (a *Actor) AddAnimation(name string, interval int64, layers []interface{})
 
 // PlayAnimation starts an animation and then calls a JavaScript function when
 // the last frame has played out. Set a null function to ignore the callback.
-func (a *Actor) PlayAnimation(name string, callback otto.Value) error {
+func (a *Actor) PlayAnimation(name string, callback goja.Value) error {
 	anim, ok := a.animations[name]
 	if !ok {
 		return fmt.Errorf("animation named '%s' not found", name)
@@ -132,5 +132,5 @@ func (a *Actor) StopAnimation() {
 	}
 
 	a.activeAnimation = nil
-	a.animationCallback = otto.NullValue()
+	a.animationCallback = goja.Null()
 }

pkg/uix/actor_collision.go

@@ -10,7 +10,7 @@ import (
 	"git.kirsle.net/apps/doodle/pkg/physics"
 	"git.kirsle.net/apps/doodle/pkg/scripting"
 	"git.kirsle.net/go/render"
-	"github.com/robertkrimen/otto"
+	"github.com/dop251/goja"
 )
 
 // loopActorCollision is the Loop function that checks if pairs of
@@ -56,8 +56,8 @@ func (w *Canvas) loopActorCollision() error {
 					a.StopAnimation()
 
 					// Call the callback function.
-					if callback.IsFunction() {
+					if function, ok := goja.AssertFunction(callback); ok {
-						callback.Call(otto.NullValue())
+						function(goja.Undefined())
 					}
 
 				}